<!DOCTYPE html>
<html lang="zh-CN">
<head>
	<meta charset="UTF-8">
	<title>call & apple</title>
</head>
<body>
	<script src="https://cdn.bootcss.com/jquery/2.1.3/jquery.min.js"></script>
	<script>
		function add(a,b){
			alert(a+b);
		}
		function sub(a,b){
			alert("a-b:"+a-b);
		}
		add.call(add,1,1);
		// http://blog.csdn.net/xllily_11/article/details/48437205
	</script>
</body>
</html>